Convert app/helper_test.go t.Fatal calls into assert/require calls (#12223)

* Convert app/helper_test.go t.Fatal calls into assert/require calls

* using Equalf

app/helper_test.go

@@ -16,6 +16,7 @@ import (
 	"github.com/mattermost/mattermost-server/mlog"
 	"github.com/mattermost/mattermost-server/model"
 	"github.com/mattermost/mattermost-server/utils"
+	"github.com/stretchr/testify/require"
 )
 
 type TestHelper struct {
@@ -499,22 +500,14 @@ func (me *TestHelper) ResetEmojisMigration() {
 
 func (me *TestHelper) CheckTeamCount(t *testing.T, expected int64) {
 	teamCount, err := me.App.Srv.Store.Team().AnalyticsTeamCount()
-	if err != nil {
-		t.Fatalf("Failed to get team count.")
-	}
-	if teamCount != expected {
-		t.Fatalf("Unexpected number of teams. Expected: %v, found: %v", expected, teamCount)
-	}
+	require.Nil(t, err, "Failed to get team count.")
+	require.Equalf(t, teamCount, expected, "Unexpected number of teams. Expected: %v, found: %v", expected, teamCount)
 }
 
 func (me *TestHelper) CheckChannelsCount(t *testing.T, expected int64) {
-	if count, err := me.App.Srv.Store.Channel().AnalyticsTypeCount("", model.CHANNEL_OPEN); err == nil {
-		if count != expected {
-			t.Fatalf("Unexpected number of channels. Expected: %v, found: %v", expected, count)
-		}
-	} else {
-		t.Fatalf("Failed to get channel count.")
-	}
+	count, err := me.App.Srv.Store.Channel().AnalyticsTypeCount("", model.CHANNEL_OPEN)
+	require.Nilf(t, err, "Failed to get channel count.")
+	require.Equalf(t, count, expected, "Unexpected number of channels. Expected: %v, found: %v", expected, count)
 }
 
 func (me *TestHelper) SetupTeamScheme() *model.Scheme {